Optional Cfm; Important Installer Note; Phase Monitor; Service Hints - Bard QW Series Installation Instructions Manual

OPTIONAL CFM

All models covered by this manual are factory set to
operate at rated CFM levels as shown in Table 4. Rated
CFM is required for ducted applications for maximum
performance ratings.
For free blow applications where Full Load Rated
CFM is undesirable due to sound levels, there is an
optional CFM that can be obtained (-10%). This CFM
level will reduce the system capacity performance by
approximately 2% at the same energy efficiency.
For Full Load Optional CFM:
1. Disconnect all power to the unit. Failure to do so
may result in damage to the motor.
2. Open hinged return air grille service panel.
3. Open control panel cover.
4. Locate low voltage terminal strip and gray wire
with white trace that connects to terminal "Y2".
Disconnect this wire from terminal "Y2" and tape
off end.
5. Reverse steps to reassemble.

IMPORTANT INSTALLER NOTE

For improved start up performance, wash the indoor
coil with dishwashing detergent.

PHASE MONITOR

All units with three phase scroll compressors are
equipped with a three phase line monitor to prevent
compressor damage due to phase reversal.
The phase monitor in this unit is equipped with two
LEDs. If the Y signal is present at the phase monitor
and phases are correct, the green LED will light and
contactor will energize. If phases are reversed, the
red fault LED will be lit and compressor operation is
inhibited.
If a fault condition occurs, reverse two of the supply
leads to the unit. Do not reverse any of the unit factory
wires as damage may occur.
Manual 2100-577C
Page 28 of 50
Delay On Make Timing
.05 minutes (30 seconds)
1.0 minutes (60 seconds)
2.0 minutes (120 Seconds)
3.0 minutes (180 seconds)
4.0 minutes (240 seconds)
5.0 minutes (300 seconds)
DOB = 123 seconds DOM
DOB = 126 seconds DOM
DOB = 132 seconds DOM
DOB = 138 seconds DOM
DOB = 144 seconds DOM
DOB = 150 seconds DOM

SERVICE HINTS

1. Caution user to maintain clean air filters at all
times and to not needlessly close off supply air
registers. This may reduce airflow through the
system which shortens equipment service life as
well as increasing operating costs and noise levels.
2. Check all power fuses or circuit breakers to be sure
that they are the correct rating.
3. The heat pump wall thermostats perform multiple
functions. Be sure that all function switches are
correctly set for the desired operating mode before
trying to diagnose any reported service problems.

SEQUENCE OF OPERATION

COOLING – A 24V solenoid coil on the reversing valve
controls the cooling cycle operation. There are two
different thermostat options. 1.) Allows for "Auto"
changeover from cycle to cycle. 2.) The other (Manual
changeover). The Auto changeover mode will cause the
reversing valve solenoid to cycle with each cooling call
and may cause a "swooshing sound" with refrigerant
equalization at the end of each cycle.
On a call for Part Load Cooling by the thermostat, it
completes a circuit from "R" to "Y1", "O" and "G" for part
load cooling. "Y1" starts the compressor, "O" energizes
the reversing valve and "G" starts the indoor blower.
On a call for Full Load Cooling by the thermostat, it
completes the same as Part Load Cooling above, but
also includes a signal to "Y2". Signal "Y2" energizes
the staging solenoid on the side of the compressor and
the signal also goes to the indoor blower to ramp-up
the airflow.
HEATING – On a call for Part Load Heating by the
thermostat, it completes a circuit from "R" to "Y1" and
"G". "Y1" starts the compressor and "G" starts the
indoor blower.
On a call for Full Load Heating by the thermostat, it
completes the same as Part Load Heating above, but
also includes a signal to "Y2". Signal "Y2" energizes
the staging solenoid on the side of the compressor and
the signal also goes to the indoor blower to ramp-up
the airflow.